Question

can males be carriers of an x - linked trait?
○ no, because males have two copies of the x chromosome
○ no, because males have only one copy of the x chromosome
○ yes, because males have one copy of the x chromosome
○ yes, because the y chromosome also codes for the trait
○ no, because females do not pass x - linked traits to male offspring

Explanation:

A "carrier" typically refers to an individual with one recessive allele for a trait (so they do not express the trait but can pass it on). Males have one X and one Y chromosome. For X-linked traits, males only have one X chromosome—if it carries the allele, they express the trait (not a carrier); if not, they don’t have the allele to pass on. Thus, males can’t be carriers of X-linked traits.

Answer:

No, because males have only one copy of the X chromosome